Blog

Balance the following equations: a. Fe + O₂ → Fe₂O₃ b. Cu(NO₃)₂ + Na₃PO₄ → Cu₃(PO₄)₂ + NaNO₃

What is the molar (amount) concentration of 4.00 g of sodium hydroxide (NaOH) dissolved in 250 mL of solution?  

Dry ice (solid CO₂) sublimates at -78.5°C. What is the difference in temperature between the sublimation point of dry ice and the boiling point of water (100.0°C), expressed in Kelvin?

In order to completely react with 10.0 g of methane (CH₄) during combustion, what mass of oxygen (O₂) is required?

Does a precipitate form when solutions of barium chloride and sodium sulfate are mixed? a) Write out the balanced chemical equation and predict whether or not a precipitate will form. (1 mark) b) Include the total ionic equation, net ionic equation, and identify the spectator ions. (3 marks)

Dani is an avid gardener. In a magazine called Fine Gardening, she reads about a new type of additive that will restore the pH level of her soil to the recommended range. Dani used a(n) _____ to learn about this new product.

Which promotion is intended to help the advertiser meet the goal of habit reinforcement?

The smallest meaningful units in a language are __________.  

Sensation is _______.

The brain’s tendency to streamline our thinking processes by use of preexisting knowledge is referred to as __________.